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LIFE-HISTORY VARIATION UNDER VARYING DEGREES OF INTRASPECIFIC COMPETITION IN THE TADPOLE SHRIMP TRIOPS LONGICAUDATUS (LECONTE)

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ABSTRACT Four lines (3 selfing and 1 sexual) of the tadpole shrimp Triops longicaudatus (LeConte), reared in the laboratory, exhibited significant reductions in growth and egg production with increasing density (5, 10, and 16 shrimp per 40-1 aquarium). Growth and fecundity were similar within the 2 morphologically distinguishable forms (long and short), whereas the long-form shrimp grew larger but produced fewer eggs than the short-form shrimp. Growth and age at death did not differ between the 2 reproductive classes. The sexual shrimp showed lower average egg production than the 3 selfing lines. Life-history trade-offs were not apparent between egg production, growth, and survivorship within any of the 4 lines examined. However, a nonsignificant negative correlation was found between mean egg production and growth among the 4 shrimp lines. These ecological results, combined with electrophoretic and morphological measures, reveal a consistent pattern of differences between the long and short forms of T. longicaudatus.

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/content/journals/10.1163/193724090x00384
1990-01-01
2016-12-10

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